#!/usr/bin/env python
#
# Copyright 2016 WebAssembly Community Group participants
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#

from __future__ import print_function
import argparse
import os
import sys

SCRIPT_DIR = os.path.dirname(os.path.abspath(__file__))
TEST_DIR = SCRIPT_DIR
REPO_ROOT_DIR = os.path.dirname(SCRIPT_DIR)
TESTSUITE_DIR = os.path.join(REPO_ROOT_DIR, 'third_party', 'testsuite')
SPEC_TEST_DIR = os.path.join(TEST_DIR, 'spec')
WASM2C_SPEC_TEST_DIR = os.path.join(TEST_DIR, 'wasm2c', 'spec')

options = None

def GetFilesWithExtension(src_dir, want_ext):
  result = set()
  if os.path.exists(src_dir):
    for filename in os.listdir(src_dir):
      name, ext = os.path.splitext(filename)
      if ext == want_ext:
        result.add(name)
  return result


def ProcessDir(wabt_test_dir, testsuite_dir, tool, flags=None):
  testsuite_tests = GetFilesWithExtension(testsuite_dir, '.wast')
  wabt_tests = GetFilesWithExtension(wabt_test_dir, '.txt')

  for removed_test_name in wabt_tests - testsuite_tests:
    test_filename = os.path.join(wabt_test_dir, removed_test_name + '.txt')
    if options.verbose:
      print('Removing %s' % test_filename)
    os.remove(test_filename)

  for added_test_name in testsuite_tests - wabt_tests:
    wast_filename = os.path.join(
        os.path.relpath(testsuite_dir, REPO_ROOT_DIR),
        added_test_name + '.wast')
    test_filename = os.path.join(wabt_test_dir, added_test_name + '.txt')
    if options.verbose:
      print('Adding %s' % test_filename)

    test_dirname = os.path.dirname(test_filename)
    if not os.path.exists(test_dirname):
      os.makedirs(test_dirname)

    with open(test_filename, 'w') as f:
      f.write(';;; TOOL: %s\n' % tool)
      f.write(';;; STDIN_FILE: %s\n' % wast_filename)
      if flags:
        f.write(';;; ARGS*: %s\n' % flags)


def ProcessProposalDir(name, flags=None):
  ProcessDir(os.path.join(SPEC_TEST_DIR, name),
             os.path.join(TESTSUITE_DIR, 'proposals', name),
             'run-interp-spec',
             flags)


def ProcessTestsuite(wabt_test_dir, testsuite_dir, tool, flags=None):
  testsuite_dir = os.path.join(TESTSUITE_DIR, reldir)
  testsuite_tests = GetFilesWithExtension(testsuite_dir, '.wast')
  wabt_test_dir = os.path.join(SPEC_TEST_DIR, reldir)
  ProcessDir(wabt_test_dir, testsuite_tests, 'run-interp-spec')


def main(args):
  parser = argparse.ArgumentParser()
  parser.add_argument('-v', '--verbose', help='print more diagnotic messages.',
                      action='store_true')
  global options
  options = parser.parse_args(args)

  ProcessDir(SPEC_TEST_DIR, TESTSUITE_DIR, 'run-interp-spec')
  ProcessDir(WASM2C_SPEC_TEST_DIR, TESTSUITE_DIR, 'run-spec-wasm2c')

  ProcessProposalDir('multi-value', '--enable-multi-value')
  ProcessProposalDir('mutable-global')  # Already enabled by default.
  ProcessProposalDir('nontrapping-float-to-int-conversions',
                     '--enable-saturating-float-to-int')
  ProcessProposalDir('sign-extension-ops', '--enable-sign-extension')

  return 0


if __name__ == '__main__':
  sys.exit(main(sys.argv[1:]))
